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rank.html

rank.html 10 KB
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  26. <div class="titlepage"><div><div><h3 class="title">
    27. 

  27. <a name="boost_typetraits.reference.rank"></a><a class="link" href="rank.html" title="rank">rank</a>
    28. 

  28. </h3></div></div></div>
    29. 

  29. <pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
    30. 

  30. <span class="keyword">struct</span> <span class="identifier">rank</span> <span class="special">:</span> <span class="keyword">public</span> <a class="link" href="integral_constant.html" title="integral_constant">integral_constant</a><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">RANK</span><span class="special">(</span><span class="identifier">T</span><span class="special">)&gt;</span> <span class="special">{};</span>
    31. 

  31. </pre>
    32. 

  32. <p>
    33. 

  33.         <span class="bold"><strong>Inherits:</strong></span> Class template rank inherits from
    34. 

  34.         <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">integral_constant</a><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">RANK</span><span class="special">(</span><span class="identifier">T</span><span class="special">)&gt;</span></code>,
    35. 

  35.         where <code class="computeroutput"><span class="identifier">RANK</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code> is the
    36. 

  36.         number of array dimensions in type <code class="computeroutput"><span class="identifier">T</span></code>.
    37. 

  37.       </p>
    38. 

  38. <p>
    39. 

  39.         If <code class="computeroutput"><span class="identifier">T</span></code> is not a (built-in)
    40. 

  40.         array type, then <code class="computeroutput"><span class="identifier">RANK</span><span class="special">(</span><span class="identifier">T</span><span class="special">)</span></code> is zero.
    41. 

  41.       </p>
    42. 

  42. <p>
    43. 

  43.         <span class="bold"><strong>Compiler Compatibility:</strong></span> All current compilers
    44. 

  44.         are supported by this trait.
    45. 

  45.       </p>
    46. 

  46. <p>
    47. 

  47.         <span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
    48. 

  48.         <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">rank</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
    49. 

  49.         or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
    50. 

  50.       </p>
    51. 

  51. <p>
    52. 

  52.         <span class="bold"><strong>Examples:</strong></span>
    53. 

  53.       </p>
    54. 

  54. <div class="blockquote"><blockquote class="blockquote"><p>
    55. 

  55.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">[]&gt;</span></code>
    56. 

  56.           inherits from <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">integral_constant</a><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span></code>.
    57. 

  57.         </p></blockquote></div>
    58. 

  58. <div class="blockquote"><blockquote class="blockquote"><p>
    59. 

  59.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="keyword">double</span><span class="special">[</span><span class="number">2</span><span class="special">][</span><span class="number">3</span><span class="special">][</span><span class="number">4</span><span class="special">]&gt;::</span><span class="identifier">type</span></code> is the type <code class="computeroutput"><a class="link" href="integral_constant.html" title="integral_constant">integral_constant</a><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="number">3</span><span class="special">&gt;</span></code>.
    60. 

  60.         </p></blockquote></div>
    61. 

  61. <div class="blockquote"><blockquote class="blockquote"><p>
    62. 

  62.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">[</span><span class="number">1</span><span class="special">]&gt;::</span><span class="identifier">value</span></code>
    63. 

  63.           is an integral constant expression that evaluates to <span class="emphasis"><em>1</em></span>.
    64. 

  64.         </p></blockquote></div>
    65. 

  65. <div class="blockquote"><blockquote class="blockquote"><p>
    66. 

  66.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">[][</span><span class="number">2</span><span class="special">]&gt;::</span><span class="identifier">value</span></code>
    67. 

  67.           is an integral constant expression that evaluates to <span class="emphasis"><em>2</em></span>.
    68. 

  68.         </p></blockquote></div>
    69. 

  69. <div class="blockquote"><blockquote class="blockquote"><p>
    70. 

  70.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*&gt;::</span><span class="identifier">value</span></code> is an integral constant expression
    71. 

  71.           that evaluates to <span class="emphasis"><em>0</em></span>.
    72. 

  72.         </p></blockquote></div>
    73. 

  73. <div class="blockquote"><blockquote class="blockquote"><p>
    74. 

  74.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="number">3</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">value</span></code> is an integral constant expression
    75. 

  75.           that evaluates to <span class="emphasis"><em>0</em></span>: <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span></code>
    76. 

  76.           is a class type and <span class="bold"><strong>not an array type</strong></span>!
    77. 

  77.         </p></blockquote></div>
    78. 

  78. <div class="blockquote"><blockquote class="blockquote"><p>
    79. 

  79.           <code class="computeroutput"><span class="identifier">rank</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value_type</span></code> is the type <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span></code>.
    80. 

  80.         </p></blockquote></div>
    81. 

  81. </div>
    82. 

  82. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    83. 

  83. <td align="left"></td>
    84. 

  84. <td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
    85. 

  85.       Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
    86. 

  86.       Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
    87. 

  87.       Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
    88. 

  88.       Watanabe<p>
    89. 

  89.         Distributed under the Boost Software License, Version 1.0. (See accompanying
    90. 

  90.         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
    91. 

  91.       </p>
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